Terazosin
Terazosin is an alpha-1 adrenergic blocker used primarily to treat benign prostatic hyperplasia (BPH) and hypertension. It works by relaxing smooth muscle in the prostate and bladder neck, improving urinary flow, and by causing vasodilation to lower blood pressure.
Alpha-blocker medication for prostate enlargement and high blood pressure that relaxes smooth muscle to improve urination and reduce blood pressure.
Key facts at a glance
- ATC
- G04CA03
- RxNorm
- 37798
- Generic
- Terazosin
- Class
- atc-g04c
- Brands
- Tezruly
- Availability
- rx
- Pregnancy
- C
- Lactation
- caution
- Routes
- oral
- Forms
- capsule, tablet, solution
- Regions
- US, EU, CN, JP
- Monitoring
- —
This page is for informational purposes only.
Do not use this information to diagnose yourself or to replace a physician's advice. Always consult a qualified healthcare provider before starting, stopping, or changing any medication. If you believe you are experiencing a medical emergency, call your local emergency number immediately.
Benign prostatic hyperplasia (BPH) to relieve urinary symptoms such as difficulty urinating and frequent urination, and hypertension as an alternative or adjunct therapy.
Terazosin selectively blocks alpha-1 adrenergic receptors in smooth muscle of the prostate, bladder neck, and blood vessels, causing muscle relaxation, improved urine flow, and decreased vascular resistance leading to lower blood pressure.
First-dose orthostatic hypotension may occur; take initial doses at bedtime. May cause dizziness, headache, or nasal congestion. Avoid operating machinery until effects are known. Inform your doctor of all medications, especially other blood pressure drugs or PDE5 inhibitors.
Official drug label
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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 27, 2026. · Read our editorial policy